This is called sexual dimorphism or plumage dimorphism in particular. During mating season male American goldfinches shed and grow bright yellow feather to attract female goldfinches, the brighter the color higher the chance to find a mate.During this season, the male goldfinch is aggressive in attacking males who goes into his territory.
Hello there
the answer is the ability of the heart to pump efficiently drops during such angry periods
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Answer:
a. they can never run out as they come back quickly
Because evolution itself is a very slow process. Having said that, the chance of having a continuum of various animals would mean that evolution would have progressed very fast. Because evolution is slow, different species establish themselves for different ecological niches and environments, this enables them to become better through time at a certain environment which then leads to eventual diversification in the number of species.
